I wish someone would use a strap on in me! Sounds like fun!
Been there, done that! It was something my wife wanted to try. There is prep involved. You need to go slow. It may not happen the first time. Be very patient. I can't believe I'm saying this, but it was amazing! The hand job with the strap-on orgasm was incredible. She enjoyed it so much, she climaxed right after I finished. It made her pump faster and that drove me close again.
A 5-hp gasoline powered stap-on works best but only if the woman is large enough to handle that motor strapped to her back. Sorry, they only come in pull-start for now and it's kind of loud, the muffler isn't that good. You might want to wear goggles and a hard hat too.